go runtime_error ai_generated true

致命错误：所有协程都在休眠 - 死锁！（无缓冲通道发送）

fatal error: all goroutines are asleep - deadlock! (unbuffered channel send)

ID: go/goroutine-unbuffered-channel-blocking

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80%修复率
87%置信度
0证据数
2024-09-18首次发现

版本兼容性

版本状态引入弃用备注
1.20 active — — —
1.21 active — — —

根因分析

无缓冲通道发送会阻塞直到有接收者就绪；如果没有接收者，协程会死锁。

English

An unbuffered channel send blocks until a receiver is ready; if no receiver exists, the goroutine deadlocks.

generic

解决方案

  1. 95% 成功率 Use a buffered channel to allow sends without immediate receiver. 
    ch := make(chan int, 1)
ch <- 42 // non-blocking
val := <-ch
fmt.Println(val)
  2. 100% 成功率 Ensure a receiver goroutine is started before sending. 
    ch := make(chan int)
go func() {
    val := <-ch
    fmt.Println(val)
}()
ch <- 42 // now receiver is ready

无效尝试

常见但无效的做法:

  1. Using a buffered channel but with size 0, which is unbuffered. 90% 失败

    make(chan int, 0) creates an unbuffered channel, still blocking.

  2. Adding a receiver in the same goroutine after the send. 100% 失败

    The send blocks before the receiver is reached, causing deadlock.